Wilson crashed into four crew members during a morning incident on pit road. Fortunately, all escaped serious injury and were released later in the day.

Dragon Racing's Chuck Homan suffered the most, having been pinned between Wilson's car and that of Dragon driver Sebastien Bourdais. Raffi Aroyan, also of Dragon, was also released from St. Michael's Hospital after being examined.

Daniel Martin of Dragon and Michael Cole of Wilson's Dale Coyne Racing team were examined at the track's infield care center and released.

Wilson said his brakes didn't grab the car, and he couldn't get out of first gear due to an unexplained sensor problem. He drove his car into the pit wall in a bid to slow it somewhat, and that likely kept the injuries from being worse.

Later in that practice session, Wilson had to drive his car into the tire barrier in turn eight to avoid t-boning Alex Tagliani's stalled car. But that wasn't all for Wilson's day.

In the afternoon session, he had a pair of mishaps in turn eight. In the first, he spun into the runoff area. In the second, he slammed into the tire barrier after the car bounced through the corner under braking.

Meanwhile, Target Chip Ganassi Racing's Dario Franchitti, a three-time Toronto winner, had the day's fastest lap at one minute, 0.278 second. Second was Simon Pagenaud of Schmidt Hamilton Racing at 1:00.390. Third was Scott Dixon (Ganassi) at 1:00.542. All three, plus Wilson, have Honda engines.

Ryan Briscoe (Team Penske) had the fastest Chevrolet at 1:00.648. The lone Lotus, driven by Simona De Silvestro, was 20th of 24 cars. Lotus has the first of its IndyCar-approved upgrades installed in its engines this weekend.

Rookie Josef Newgarden did not turn a lap due to what Sarah Fisher Hartman Racing officials described as a fuel pickup problem.